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		<h1 id="0047-the-scalebutton-and-volumebutton">0047: The ScaleButton and VolumeButton</h1>

<p>Because the <code class="language-plaintext highlighter-rouge">ScaleButton</code> is the more involved of these two, I’m going to start with…</p>

<h2 id="the-volumebutton">The VolumeButton</h2>

<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img0" src="../images/screenshots/002_button/button_22.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal0" class="modal">																	<!-- modal# -->
				<span class="close0">&times;</span>															<!-- close# -->
				<img class="modal-content" id="img00" />															<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal0");														// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img0");															// img#
			var modalImg = document.getElementById("img00");													// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close0")[0];											// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img1" src="../images/screenshots/002_button/button_22_term.png" alt="Current example terminal output" />		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal1" class="modal">																				<!-- modal# -->
				<span class="close1">&times;</span>																		<!-- close# -->
				<img class="modal-content" id="img11" />																		<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal1");																	// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img1");																		// img#
			var modalImg = document.getElementById("img11");																// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close1")[0];														// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																								<!-- ------------- filename (below) --------- -->
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/002_button/button_22_volume.d" target="_blank">here</a>.
	</div>
</div>

<p>As with our previous example of the <code class="language-plaintext highlighter-rouge">SpinButton</code>, nothing really changes at the top of the file except a couple of import statements:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">import</span> <span class="n">gtk</span><span class="p">.</span><span class="n">VolumeButton</span><span class="p">;</span>
<span class="k">import</span> <span class="n">gtk</span><span class="p">.</span><span class="n">ScaleButton</span><span class="p">;</span>
<span class="k">import</span> <span class="n">gtk</span><span class="p">.</span><span class="n">Adjustment</span><span class="p">;</span>
</code></pre></div></div>

<p>and the class derived from the <code class="language-plaintext highlighter-rouge">VolumeButton</code>:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">class</span> <span class="n">MyVolumeButton</span> <span class="p">:</span> <span class="n">VolumeButton</span>
<span class="p">{</span>
	<span class="kt">double</span> <span class="n">minimum</span> <span class="p">=</span> <span class="mi">0</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">maximum</span> <span class="p">=</span> <span class="mi">10</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">step</span> <span class="p">=</span> <span class="mi">1</span><span class="p">;</span>

	<span class="n">Adjustment</span> <span class="n">adjustment</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">initialValue</span> <span class="p">=</span> <span class="mi">7</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">pageIncrement</span> <span class="p">=</span> <span class="mi">1</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">pageSize</span> <span class="p">=</span> <span class="mi">1</span><span class="p">;</span>
	
	<span class="k">this</span><span class="p">()</span>
	<span class="p">{</span>
		<span class="kt">double</span> <span class="n">compensateForWinBug</span> <span class="p">=</span> <span class="n">initialValue</span> <span class="p">+</span> <span class="mi">1</span><span class="p">;</span>
		<span class="k">super</span><span class="p">();</span>
		
		<span class="n">adjustment</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Adjustment</span><span class="p">(</span><span class="n">compensateForWinBug</span><span class="p">,</span> <span class="n">minimum</span><span class="p">,</span> <span class="n">maximum</span><span class="p">,</span> <span class="n">step</span><span class="p">,</span> <span class="n">pageIncrement</span><span class="p">,</span> <span class="n">pageSize</span><span class="p">);</span>
		<span class="n">setAdjustment</span><span class="p">(</span><span class="n">adjustment</span><span class="p">);</span>
		<span class="n">setValue</span><span class="p">(</span><span class="n">initialValue</span><span class="p">);</span>
		<span class="n">addOnValueChanged</span><span class="p">(&amp;</span><span class="n">valueChanged</span><span class="p">);</span>
		
	<span class="p">}</span> <span class="c1">// this()</span>
	
	
	<span class="kt">void</span> <span class="n">valueChanged</span><span class="p">(</span><span class="kt">double</span> <span class="n">value</span><span class="p">,</span> <span class="n">ScaleButton</span> <span class="n">sb</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="n">writeln</span><span class="p">(</span><span class="n">getValue</span><span class="p">());</span>
		
	<span class="p">}</span> <span class="c1">// valueChanged()</span>


<span class="p">}</span> <span class="c1">// class MyVolumeButton</span>
</code></pre></div></div>

<p>As before, we have to set up an <code class="language-plaintext highlighter-rouge">Adjustment</code> object in the constructor, but you’ll notice there’s an extra step.</p>

<p>When we instantiate the <code class="language-plaintext highlighter-rouge">Adjustment</code>, the initial value is set to <code class="language-plaintext highlighter-rouge">compensateForWinBug</code> which is evaluated as <code class="language-plaintext highlighter-rouge">initialValue + 1</code> and later, it’s set again:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code>      <span class="n">setValue</span><span class="p">(</span><span class="n">initialValue</span><span class="p">);</span>
</code></pre></div></div>

<p>This is because the <em>Windows</em> version of <em>GTK</em> has a bug that—at runtime—causes the wrong icon to be shown initially when using the <code class="language-plaintext highlighter-rouge">ScaleButton</code> or its child, the <code class="language-plaintext highlighter-rouge">VolumeButton</code>. And the workaround is to set the <code class="language-plaintext highlighter-rouge">Adjustment</code>’s initial value and then change it right away before the user sees it.</p>

<p>Also, because the value of <code class="language-plaintext highlighter-rouge">compensateForWinBug</code> depends on the value of another variable, we have to set it inside a function because the compiler won’t know the value of that other variable at compile time.</p>

<p>Anyway, so much for the <code class="language-plaintext highlighter-rouge">VolumeButton</code>. Let’s look at its parent…</p>

<h2 id="the-scalebutton">The ScaleButton</h2>

<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img2" src="../images/screenshots/002_button/button_21.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal2" class="modal">																<!-- modal# -->
				<span class="close2">&times;</span>														<!-- close# -->
				<img class="modal-content" id="img22" />														<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal2");													// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img2");														// img#
			var modalImg = document.getElementById("img22");												// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close2")[0];										// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img3" src="../images/screenshots/002_button/button_21_term.png" alt="Current example terminal output" /> 		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal3" class="modal">																			<!-- modal# -->
				<span class="close3">&times;</span>																	<!-- close# -->
				<img class="modal-content" id="img33" />																	<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal3");																// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img3");																	// img#
			var modalImg = document.getElementById("img33");															// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close3")[0];													// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																							<!--------- filename (below) ------------>
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/002_button/button_21_scale.d" target="_blank">here</a>.
	</div>
</div>

<p>I’m presenting this example second because the ScaleButton needs a set of icons passed in when it’s instantiated. Rather than being a big pain, however, it means we can play around with the icons displayed on the button when various values are set.</p>

<p><em>Note: You can use the ScaleButton with an empty icon array, but it ain’t pretty.</em></p>

<p>The obvious set of icons to use is the same one found on the <code class="language-plaintext highlighter-rouge">VolumeButton</code>, but after a few minutes of digging in the icon folders, I found some that better suited the purposes of this demonstration. But before we go there</p>

<p><strong><code class="language-plaintext highlighter-rouge">&lt;Reminder Mode: ON&gt;</code></strong></p>

<h3 id="icons">Icons</h3>

<p>Two things to remember…</p>

<p>First, you’ll wanna know where they are. On <em>Windows</em>:</p>

<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>C:\Program Files\GTK3-Runtime Win64\share\icons
</code></pre></div></div>

<p>or here:</p>

<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>C:\Program Files\GTK3-Runtime\share\icons
</code></pre></div></div>

<p>On Linux:</p>

<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>/usr/share/icons
</code></pre></div></div>

<p>Second, the icons used for buttons are the 16x16 set.</p>

<p><strong><code class="language-plaintext highlighter-rouge">&lt;Reminder Mode OFF&gt;</code></strong></p>

<h3 id="the-scalebutton-class">The ScaleButton Class</h3>

<p>As before, only one segment of this code file is different (and, truth be told, not all that different):</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">class</span> <span class="n">MyScaleButton</span> <span class="p">:</span> <span class="n">ScaleButton</span>
<span class="p">{</span>
	<span class="kt">double</span> <span class="n">minimum</span> <span class="p">=</span> <span class="mi">0</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">maximum</span> <span class="p">=</span> <span class="mi">10</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">step</span> <span class="p">=</span> <span class="mi">1</span><span class="p">;</span>

	<span class="n">Adjustment</span> <span class="n">adjustment</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">initialValue</span> <span class="p">=</span> <span class="mi">5</span><span class="p">;</span>

	<span class="kt">double</span> <span class="n">pageIncrement</span> <span class="p">=</span> <span class="mi">1</span><span class="p">;</span>
	<span class="kt">double</span> <span class="n">pageSize</span> <span class="p">=</span> <span class="mi">0</span><span class="p">;</span>
	
<span class="c1">//	string[] icons = ["audio-volume-muted", "audio-volume-high", "audio-volume-low", "audio-volume-medium"];</span>
	<span class="nb">string</span><span class="p">[]</span> <span class="n">icons</span> <span class="p">=</span> <span class="p">[</span><span class="s">"face-crying"</span><span class="p">,</span> <span class="s">"face-laugh"</span><span class="p">,</span> <span class="s">"face-embarrassed"</span><span class="p">,</span> <span class="s">"face-sad"</span><span class="p">,</span> <span class="s">"face-plain"</span><span class="p">,</span> <span class="s">"face-smirk"</span><span class="p">,</span> <span class="s">"face-smile"</span><span class="p">];</span>
<span class="c1">//	string[] icons = ["face-crying", "face-laugh", "face-plain"];</span>
<span class="c1">//	string[] icons = ["face-crying", "face-laugh"];</span>
<span class="c1">//	string[] icons = ["face-plain"];</span>
	
	<span class="k">this</span><span class="p">()</span>
	<span class="p">{</span>
		<span class="kt">double</span> <span class="n">compensateForWinBug</span> <span class="p">=</span> <span class="n">initialValue</span> <span class="p">+</span> <span class="mi">1</span><span class="p">;</span>

		<span class="k">super</span><span class="p">(</span><span class="n">IconSize</span><span class="p">.</span><span class="n">BUTTON</span><span class="p">,</span> <span class="n">minimum</span><span class="p">,</span> <span class="n">maximum</span><span class="p">,</span> <span class="n">step</span><span class="p">,</span> <span class="n">icons</span><span class="p">);</span>
		
		<span class="n">adjustment</span> <span class="p">=</span> <span class="k">new</span> <span class="n">Adjustment</span><span class="p">(</span><span class="n">compensateForWinBug</span><span class="p">,</span> <span class="n">minimum</span><span class="p">,</span> <span class="n">maximum</span><span class="p">,</span> <span class="n">step</span><span class="p">,</span> <span class="n">pageIncrement</span><span class="p">,</span> <span class="n">pageSize</span><span class="p">);</span>
		<span class="n">setAdjustment</span><span class="p">(</span><span class="n">adjustment</span><span class="p">);</span>
		<span class="n">setValue</span><span class="p">(</span><span class="n">initialValue</span><span class="p">);</span>
<span class="c1">//		addOnValueChanged(&amp;valueChanged);</span>
		
	<span class="p">}</span> <span class="c1">// this()</span>
	
	
	<span class="kt">void</span> <span class="n">valueChanged</span><span class="p">(</span><span class="n">ScaleButton</span> <span class="n">sb</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="n">writeln</span><span class="p">(</span><span class="n">getValue</span><span class="p">());</span>
		
	<span class="p">}</span> <span class="c1">// valueChanged()</span>


<span class="p">}</span> <span class="c1">// class MyScaleButton</span>
</code></pre></div></div>

<p>As with the <code class="language-plaintext highlighter-rouge">VolumeButton</code>, we have to set and then reset the initial value so the proper icon is displayed on start-up, but now let’s talk about this icon stuff…</p>

<h3 id="defining-an-icon-set">Defining an Icon Set</h3>

<p>There are two ways to go about this:</p>

<ul>
  <li>with a set (read: array) of just two icons:
    <ul>
      <li>the first is used for the lower end of the scale, and</li>
      <li>the second is used for the high end, but</li>
    </ul>
  </li>
  <li>with three icons:
    <ul>
      <li>the first is used for the minimum setting only,</li>
      <li>the second is used for the maximum setting only,</li>
      <li>and the third is used for everything in between, but-but…</li>
    </ul>
  </li>
  <li>with four or more icons,
    <ul>
      <li>the first and second are used for minimum and maximum, and</li>
      <li>the rest are spread evenly across the rest of the range.</li>
    </ul>
  </li>
</ul>

<p>I left a bunch of different icon sets commented out in the code file so you have something to experiment with.</p>

<h2 id="conclusion">Conclusion</h2>

<p>And there you go, the <code class="language-plaintext highlighter-rouge">ScaleButton</code> and the <code class="language-plaintext highlighter-rouge">VolumeButton</code> in party hats. Stay happy, keep coding, and see you next time.</p>

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